At 6 feet 2 and about 250 pounds, Karras was squatty and powerful. He was “stocky, like a bowling ball,” writes one of his main on-field antagonists, Packers guard Jerry Kramer, in “Instant
Replay,” his diary of the 1967 season (Doubleday, 2006, p. 150, originally published in 1968 by The New American Library). And yet Karras was light on his feet. His coaches in Detroit referred to him
as Mr. Twinkletoes.

… Karras was primarily an outside pass rusher. At the snap, he tended to feint a move to the inside to try to force the guard to shift his weight to his inside foot, and then Karras would
quickly break back to his outside. “One of his moves is a little hop and a skip to the outside,” said Jerry Kramer. “He actually hops, and it looks funny, but it works.” (Instant
Replay, p. 129) Karras used an inside move only as a change-up. He also occasionally used a bull-rush technique in which he dropped his head and drove it into the upper chest of the blocker.